Malicious PDF — malware analysis report

Static analysis result for SHA-256 576a6686872f17a8…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 18:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2ea89eb61faa78c7bc99abaa2872d32 SHA-1: 5e6e84cded27d90ac344c62b331c036455c788d2 SHA-256: 576a6686872f17a80331b90656ab72eaf90d396a7e7454537338abd32ba825b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=ananya+indian+idol PDF link annotation
    • https://movie2book.com/userfiles/file/fanubu.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20211001155620.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/46989870271.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/medilaketiz.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/60737485053.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/59ncvqh1kreg5ttats4pe4nfl3/kemeredibasofasu.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/36284528187.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/48014302671.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145923c7c7f5---samab.pdfIn PDF document text
    • https://ntc-container.com/upload/files/11155605392.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/93031994188.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/2629974462.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/76258783068.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/36464414378.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/44073840841.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/887eb0abc608c661bc5968c3ef88da6a/gineru.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/kakojefizezizelotavo.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/49526066308.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/tagexotemorovejeledojifi.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/diwesuxudebiwodeto.pdfIn PDF document text
    • http://ty-int.com/files/files/89343808708.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210922211306132549.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/lufoxanata.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/55882842102.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc5d997c2---xotadolalibojonalaxulu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 9840 bytes
SHA-256: 30dd315efb6c4feab154e41405dfcf4d90e8055985739efad15b03e21216894c
font_01_sfnt_off0000c918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC918 16452 bytes
SHA-256: 248bdaa517ce7797347687e2318a29f79772570f2f7070fdce84863208cc511f
font_02_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1